Commercial, personal and sensitive information is very hard to keep secure, and technological solutions are not the only answer. In today's technology-driven environment, there is an ever-increasing demand for information delivery on various devices in the office, at home and in public places. A compromise has to be struck between security of information and its availability. This book provides significant first steps along the path of dealing with information assurance in a realistic and comprehensive manner. The third edition has been updated to reflect changes in the IT security landscape and updates to the BCS Certification in Information Security Management Principles, which the book supports.